<!DOCTYPE html>
<html>
<head>
  <script src="https://cdn.rawgit.com/konvajs/konva/1.4.0/konva.min.js"></script>
  <meta charset="utf-8">
  <title>Konva Zoom Image on Hover Demo</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      overflow: hidden;
      background-color: #F0F0F0;
    }
  </style>
</head>
<body>
  <div id="container"></div>
  <script>
    var width = window.innerWidth;
    var height = window.innerHeight;
    
    var stage = new Konva.Stage({
      container: 'container',
      width: width,
      height: height
    });

    var layer = new Konva.Layer();

    stage.add(layer);

    var imageObj = new Image();
    imageObj.onload = function() {
        var backgroundImage = new Konva.Image({
            x: 0,
            y: 0,
            width: width,
            height: height,
            image: imageObj
        });
        layer.add(backgroundImage);
        layer.draw();
    };

    imageObj.src = '/assets/space.jpg';

    var zoomLevel = 2;
    layer.on('mouseenter', function() {
        layer.scale({
            x : zoomLevel,
            y : zoomLevel
        });
        layer.draw();
    });

    layer.on('mousemove', function(e) {
        var pos = stage.getPointerPosition();
        layer.x( - (pos.x));
        layer.y( - (pos.y));
        layer.draw();
    });

    layer.on('mouseleave', function() {
        layer.x(0);
        layer.y(0);
        layer.scale({
            x : 1,
            y : 1
        });
        layer.draw();
    });
  </script>

</body>
</html>